Suffolk County prosecutors have charged the sister of an accused murderer with threatening two witnesses in his case over the phone and on Facebook.

Jelaine Flores, 18, of Boston, was arraigned Wednesday in Charlestown Municipal Court on two counts of witness intimidation and one count of making harassing phone calls, Suffolk District Attorney Daniel F. Conley’s office said in a statement.

An automatic not-guilty plea was entered on her behalf and bail was set at $3,500 cash. If she posts that bail, she will be required to wear a GPS tracking device and have no contact with the victims, according to prosecutors.

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Flores is the sister of 20-year-old Pablo Flores, also of Charlestown, who is accused of fatally shooting Steven Jones near the intersection of Medford Street and Monument Avenue in Charlestown on May 7.

Pablo Flores is currently being sought by Boston police on a charge of murder.

In the days after Jones’s murder, Jelaine Flores allegedly threatened to harm one witness to the crime in a phone call and called another a “snitch” in a Facebook posting, prosecutors said. She is due back in court June 19.